Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc42509564089a7f…

MALICIOUS

PDF

77.0 KB Created: 2021-09-21 01:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5eb5fa2e05aa019f4cdf02d1d5c01a58 SHA-1: 5639fd6b66d5b838d2e7777e2906b96a14dfe2ad SHA-256: bc42509564089a7f8759e57ad901b3d5f7598882a4474cae626e4eb79f4cab53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to link farms on compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=download+store+app+for+windows+10 PDF link annotation
    • http://markone-tools.com/upload/files/tixevi.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/zimedexaxoginurisoboru.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/jelikizevemuse.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/witej.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/laxuviwixi.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/62946848588.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/57612417188.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/68923002298.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/xakatisafalox.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/wusababitumezuk.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/52300609701.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/f2a1c3beeb3819672038708b53fbfcbd/41079970038.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/wopoj.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/31237396688.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2a06906df---23655150.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/p77apcshpvge2iraiptfom1otn/gabik.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/wogugukuvutupoxu.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/wofivuxowetedexaxo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/o1dq72s5fhupf2kgou4rob8gtk/883936251.pdfIn PDF document text
    • http://heizler.hu/files/file/73420835921.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/13082249365.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/bijigorekebamupubeb.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/damisubozuxunof.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC836 17684 bytes
SHA-256: f1c14cc09e7a52d141d6ce3d636bbb26ceb631055ceceadf62c0b3ed5139e9a9
font_01_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 10752 bytes
SHA-256: 30392e96e6d1730f2b066ec3119a0eebda90559a9543b02855de4f90a03e9efc
font_02_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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